Loosing power on acceleration

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2006 Mazda6 GT V6 sport/hatchback 6MT
Hi everyone. Just bought my 2006 mazda6 gt hatchback V6. It's a great car, but just this weekend it started loosing power at the bottom end of all my rev ranges. I'm thinking it's either spark plugs or coils need to be replaced. Is there anything else that would make the car shudder like that when I give it gas, or should I just stick with the plugs and coils?
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